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Message-Id: <b204c5d4514134e1b2de9c1959da71514d1f1340.1617885385.git.lorenzo@kernel.org>
Date: Thu, 8 Apr 2021 14:50:54 +0200
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: bpf@...r.kernel.org, netdev@...r.kernel.org
Cc: lorenzo.bianconi@...hat.com, davem@...emloft.net, kuba@...nel.org,
ast@...nel.org, daniel@...earbox.net, shayagr@...zon.com,
sameehj@...zon.com, john.fastabend@...il.com, dsahern@...nel.org,
brouer@...hat.com, echaudro@...hat.com, jasowang@...hat.com,
alexander.duyck@...il.com, saeed@...nel.org,
maciej.fijalkowski@...el.com
Subject: [PATCH v8 bpf-next 02/14] xdp: add xdp_shared_info data structure
Introduce xdp_shared_info data structure to contain info about
"non-linear" xdp frame. xdp_shared_info will alias skb_shared_info
allowing to keep most of the frags in the same cache-line.
Introduce some xdp_shared_info helpers aligned to skb_frag* ones
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
drivers/net/ethernet/marvell/mvneta.c | 62 +++++++++++++++------------
include/net/xdp.h | 55 ++++++++++++++++++++++--
2 files changed, 85 insertions(+), 32 deletions(-)
diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index f20dfd1d7a6b..a52e132fd2cf 100644
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -2036,14 +2036,17 @@ int mvneta_rx_refill_queue(struct mvneta_port *pp, struct mvneta_rx_queue *rxq)
static void
mvneta_xdp_put_buff(struct mvneta_port *pp, struct mvneta_rx_queue *rxq,
- struct xdp_buff *xdp, struct skb_shared_info *sinfo,
+ struct xdp_buff *xdp, struct xdp_shared_info *xdp_sinfo,
int sync_len)
{
int i;
- for (i = 0; i < sinfo->nr_frags; i++)
+ for (i = 0; i < xdp_sinfo->nr_frags; i++) {
+ skb_frag_t *frag = &xdp_sinfo->frags[i];
+
page_pool_put_full_page(rxq->page_pool,
- skb_frag_page(&sinfo->frags[i]), true);
+ xdp_get_frag_page(frag), true);
+ }
page_pool_put_page(rxq->page_pool, virt_to_head_page(xdp->data),
sync_len, true);
}
@@ -2181,7 +2184,7 @@ mvneta_run_xdp(struct mvneta_port *pp, struct mvneta_rx_queue *rxq,
struct bpf_prog *prog, struct xdp_buff *xdp,
u32 frame_sz, struct mvneta_stats *stats)
{
- struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp);
+ struct xdp_shared_info *xdp_sinfo = xdp_get_shared_info_from_buff(xdp);
unsigned int len, data_len, sync;
u32 ret, act;
@@ -2202,7 +2205,7 @@ mvneta_run_xdp(struct mvneta_port *pp, struct mvneta_rx_queue *rxq,
err = xdp_do_redirect(pp->dev, xdp, prog);
if (unlikely(err)) {
- mvneta_xdp_put_buff(pp, rxq, xdp, sinfo, sync);
+ mvneta_xdp_put_buff(pp, rxq, xdp, xdp_sinfo, sync);
ret = MVNETA_XDP_DROPPED;
} else {
ret = MVNETA_XDP_REDIR;
@@ -2213,7 +2216,7 @@ mvneta_run_xdp(struct mvneta_port *pp, struct mvneta_rx_queue *rxq,
case XDP_TX:
ret = mvneta_xdp_xmit_back(pp, xdp);
if (ret != MVNETA_XDP_TX)
- mvneta_xdp_put_buff(pp, rxq, xdp, sinfo, sync);
+ mvneta_xdp_put_buff(pp, rxq, xdp, xdp_sinfo, sync);
break;
default:
bpf_warn_invalid_xdp_action(act);
@@ -2222,7 +2225,7 @@ mvneta_run_xdp(struct mvneta_port *pp, struct mvneta_rx_queue *rxq,
trace_xdp_exception(pp->dev, prog, act);
fallthrough;
case XDP_DROP:
- mvneta_xdp_put_buff(pp, rxq, xdp, sinfo, sync);
+ mvneta_xdp_put_buff(pp, rxq, xdp, xdp_sinfo, sync);
ret = MVNETA_XDP_DROPPED;
stats->xdp_drop++;
break;
@@ -2243,9 +2246,9 @@ mvneta_swbm_rx_frame(struct mvneta_port *pp,
{
unsigned char *data = page_address(page);
int data_len = -MVNETA_MH_SIZE, len;
+ struct xdp_shared_info *xdp_sinfo;
struct net_device *dev = pp->dev;
enum dma_data_direction dma_dir;
- struct skb_shared_info *sinfo;
if (*size > MVNETA_MAX_RX_BUF_SIZE) {
len = MVNETA_MAX_RX_BUF_SIZE;
@@ -2268,8 +2271,8 @@ mvneta_swbm_rx_frame(struct mvneta_port *pp,
xdp_prepare_buff(xdp, data, pp->rx_offset_correction + MVNETA_MH_SIZE,
data_len, false);
- sinfo = xdp_get_shared_info_from_buff(xdp);
- sinfo->nr_frags = 0;
+ xdp_sinfo = xdp_get_shared_info_from_buff(xdp);
+ xdp_sinfo->nr_frags = 0;
}
static void
@@ -2277,7 +2280,7 @@ mvneta_swbm_add_rx_fragment(struct mvneta_port *pp,
struct mvneta_rx_desc *rx_desc,
struct mvneta_rx_queue *rxq,
struct xdp_buff *xdp, int *size,
- struct skb_shared_info *xdp_sinfo,
+ struct xdp_shared_info *xdp_sinfo,
struct page *page)
{
struct net_device *dev = pp->dev;
@@ -2300,13 +2303,13 @@ mvneta_swbm_add_rx_fragment(struct mvneta_port *pp,
if (data_len > 0 && xdp_sinfo->nr_frags < MAX_SKB_FRAGS) {
skb_frag_t *frag = &xdp_sinfo->frags[xdp_sinfo->nr_frags++];
- skb_frag_off_set(frag, pp->rx_offset_correction);
- skb_frag_size_set(frag, data_len);
- __skb_frag_set_page(frag, page);
+ xdp_set_frag_offset(frag, pp->rx_offset_correction);
+ xdp_set_frag_size(frag, data_len);
+ xdp_set_frag_page(frag, page);
/* last fragment */
if (len == *size) {
- struct skb_shared_info *sinfo;
+ struct xdp_shared_info *sinfo;
sinfo = xdp_get_shared_info_from_buff(xdp);
sinfo->nr_frags = xdp_sinfo->nr_frags;
@@ -2323,10 +2326,13 @@ static struct sk_buff *
mvneta_swbm_build_skb(struct mvneta_port *pp, struct mvneta_rx_queue *rxq,
struct xdp_buff *xdp, u32 desc_status)
{
- struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp);
- int i, num_frags = sinfo->nr_frags;
+ struct xdp_shared_info *xdp_sinfo = xdp_get_shared_info_from_buff(xdp);
+ int i, num_frags = xdp_sinfo->nr_frags;
+ skb_frag_t frag_list[MAX_SKB_FRAGS];
struct sk_buff *skb;
+ memcpy(frag_list, xdp_sinfo->frags, sizeof(skb_frag_t) * num_frags);
+
skb = build_skb(xdp->data_hard_start, PAGE_SIZE);
if (!skb)
return ERR_PTR(-ENOMEM);
@@ -2338,12 +2344,12 @@ mvneta_swbm_build_skb(struct mvneta_port *pp, struct mvneta_rx_queue *rxq,
mvneta_rx_csum(pp, desc_status, skb);
for (i = 0; i < num_frags; i++) {
- skb_frag_t *frag = &sinfo->frags[i];
+ struct page *page = xdp_get_frag_page(&frag_list[i]);
skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
- skb_frag_page(frag), skb_frag_off(frag),
- skb_frag_size(frag), PAGE_SIZE);
- page_pool_release_page(rxq->page_pool, skb_frag_page(frag));
+ page, xdp_get_frag_offset(&frag_list[i]),
+ xdp_get_frag_size(&frag_list[i]), PAGE_SIZE);
+ page_pool_release_page(rxq->page_pool, page);
}
return skb;
@@ -2356,7 +2362,7 @@ static int mvneta_rx_swbm(struct napi_struct *napi,
{
int rx_proc = 0, rx_todo, refill, size = 0;
struct net_device *dev = pp->dev;
- struct skb_shared_info sinfo;
+ struct xdp_shared_info xdp_sinfo;
struct mvneta_stats ps = {};
struct bpf_prog *xdp_prog;
u32 desc_status, frame_sz;
@@ -2365,7 +2371,7 @@ static int mvneta_rx_swbm(struct napi_struct *napi,
xdp_init_buff(&xdp_buf, PAGE_SIZE, &rxq->xdp_rxq);
xdp_buf.data_hard_start = NULL;
- sinfo.nr_frags = 0;
+ xdp_sinfo.nr_frags = 0;
/* Get number of received packets */
rx_todo = mvneta_rxq_busy_desc_num_get(pp, rxq);
@@ -2409,7 +2415,7 @@ static int mvneta_rx_swbm(struct napi_struct *napi,
}
mvneta_swbm_add_rx_fragment(pp, rx_desc, rxq, &xdp_buf,
- &size, &sinfo, page);
+ &size, &xdp_sinfo, page);
} /* Middle or Last descriptor */
if (!(rx_status & MVNETA_RXD_LAST_DESC))
@@ -2417,7 +2423,7 @@ static int mvneta_rx_swbm(struct napi_struct *napi,
continue;
if (size) {
- mvneta_xdp_put_buff(pp, rxq, &xdp_buf, &sinfo, -1);
+ mvneta_xdp_put_buff(pp, rxq, &xdp_buf, &xdp_sinfo, -1);
goto next;
}
@@ -2429,7 +2435,7 @@ static int mvneta_rx_swbm(struct napi_struct *napi,
if (IS_ERR(skb)) {
struct mvneta_pcpu_stats *stats = this_cpu_ptr(pp->stats);
- mvneta_xdp_put_buff(pp, rxq, &xdp_buf, &sinfo, -1);
+ mvneta_xdp_put_buff(pp, rxq, &xdp_buf, &xdp_sinfo, -1);
u64_stats_update_begin(&stats->syncp);
stats->es.skb_alloc_error++;
@@ -2446,12 +2452,12 @@ static int mvneta_rx_swbm(struct napi_struct *napi,
napi_gro_receive(napi, skb);
next:
xdp_buf.data_hard_start = NULL;
- sinfo.nr_frags = 0;
+ xdp_sinfo.nr_frags = 0;
}
rcu_read_unlock();
if (xdp_buf.data_hard_start)
- mvneta_xdp_put_buff(pp, rxq, &xdp_buf, &sinfo, -1);
+ mvneta_xdp_put_buff(pp, rxq, &xdp_buf, &xdp_sinfo, -1);
if (ps.xdp_redirect)
xdp_do_flush_map();
diff --git a/include/net/xdp.h b/include/net/xdp.h
index 842580a61563..02aea7696d15 100644
--- a/include/net/xdp.h
+++ b/include/net/xdp.h
@@ -109,10 +109,54 @@ xdp_prepare_buff(struct xdp_buff *xdp, unsigned char *hard_start,
((xdp)->data_hard_start + (xdp)->frame_sz - \
SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
-static inline struct skb_shared_info *
+struct xdp_shared_info {
+ u16 nr_frags;
+ u16 data_length; /* paged area length */
+ skb_frag_t frags[MAX_SKB_FRAGS];
+};
+
+static inline struct xdp_shared_info *
xdp_get_shared_info_from_buff(struct xdp_buff *xdp)
{
- return (struct skb_shared_info *)xdp_data_hard_end(xdp);
+ BUILD_BUG_ON(sizeof(struct xdp_shared_info) >
+ sizeof(struct skb_shared_info));
+ return (struct xdp_shared_info *)xdp_data_hard_end(xdp);
+}
+
+static inline struct page *xdp_get_frag_page(const skb_frag_t *frag)
+{
+ return frag->bv_page;
+}
+
+static inline unsigned int xdp_get_frag_offset(const skb_frag_t *frag)
+{
+ return frag->bv_offset;
+}
+
+static inline unsigned int xdp_get_frag_size(const skb_frag_t *frag)
+{
+ return frag->bv_len;
+}
+
+static inline void *xdp_get_frag_address(const skb_frag_t *frag)
+{
+ return page_address(xdp_get_frag_page(frag)) +
+ xdp_get_frag_offset(frag);
+}
+
+static inline void xdp_set_frag_page(skb_frag_t *frag, struct page *page)
+{
+ frag->bv_page = page;
+}
+
+static inline void xdp_set_frag_offset(skb_frag_t *frag, u32 offset)
+{
+ frag->bv_offset = offset;
+}
+
+static inline void xdp_set_frag_size(skb_frag_t *frag, u32 size)
+{
+ frag->bv_len = size;
}
struct xdp_frame {
@@ -142,12 +186,15 @@ static __always_inline void xdp_frame_bulk_init(struct xdp_frame_bulk *bq)
bq->xa = NULL;
}
-static inline struct skb_shared_info *
+static inline struct xdp_shared_info *
xdp_get_shared_info_from_frame(struct xdp_frame *frame)
{
void *data_hard_start = frame->data - frame->headroom - sizeof(*frame);
- return (struct skb_shared_info *)(data_hard_start + frame->frame_sz -
+ /* xdp_shared_info struct must be aligned to skb_shared_info
+ * area in buffer tailroom
+ */
+ return (struct xdp_shared_info *)(data_hard_start + frame->frame_sz -
SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
}
--
2.30.2
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